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4 layers85 × 120 mmPrototype imu, the printed circuit board in 3D

Primary PCB improvement

Size
85 × 120 mm
Copper layers
4
Thickness
1.6 mm
Parts
27
Nets
67
Pads
197
Tracks, vias
362, 18
Pours
4
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
28 Feb 2026
Updated
7 Mar 2026

Overview

Prototype imu is an open-source printed circuit board by hyang025, from the hyang025/Primary_PCB repository on GitHub. It is a 4-layer board of 85 × 120 mm with 27 parts on 67 nets, routed with 362 tracks and 18 vias.

It is built around the BMI088 and 500SSP1S2M2QEA. Its parts include 7 connectors, 6 resistors, 6 diodes, 4 ICs and 2 switches. It belongs with the sensors and measurement boards and the RP2040 boards of this library.

Main components

2

Parts

27
QtyValueFootprintReferences
6LEDDiode_SMD:D_1206_3216Metric_Pad1.42x1.75mm_HandSolderD1, D2, D3, D4, D5, D6
4330Diode_SMD:D_1206_3216Metric_Pad1.42x1.75mm_HandSolderR1, R2, R4, R5
3Conn_01x04Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_VerticalJ1, J3, J4
2500Diode_SMD:D_1206_3216Metric_Pad1.42x1.75mm_HandSolderR3, R6
2500SSP1S2M2QEAAstrobotics:SwitchSW1, SW2
2Conn_01x05Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_VerticalJ5, J7
1100nfCapacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolderC1
1BMI088Astrobotics:IMU_BMI088U1
1Conn_01x02Astrobotics:AndersonPCBJ6
1Conn_01x02Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_VerticalJ2
1PKE3311PIAstrobotics:DCDCU4
1RaspberryPi_PicoModule:RaspberryPi_Pico_Common_UnspecifiedA2
1~Astrobotics:GNSS RTK ZEDF9PU2
1~Connector_JST:JST_EH_B8B-EH-A_1x08_P2.50mm_VerticalU3

Questions

How big is the Prototype imu PCB?

It measures 85 × 120 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Prototype imu use?

27 parts, built around the BMI088 and 500SSP1S2M2QEA. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Prototype imu KiCad files?

From the hyang025/Primary_PCB repository on GitHub, at the commit this page was made from: the board is Prototype_imu.kicad_pcb and its schematic LoraRtk.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Prototype imu design in my own project?

Its repository states no licence, so its author keeps all rights: ask hyang025 before reusing the design.

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